Medium 5.5Published Apr 22, 2026

CVE-2026-31438netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

Updated under an hour ago (Oct 27, 2026, 10:40 AM ET)

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In the Linux kernel, the following vulnerability has been resolved: netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators When a process crashes and the kernel writes a core dump to a 9P filesystem, __kernel_write() creates an ITER_KVEC iterator. This iterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which only handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types, hitting the BUG() for any other type. Fix this by adding netfs_limit_kvec() following the same pattern as netfs_limit_bvec(), since both kvec and bvec are simple segment arrays with pointer and length fields. Dispatch it from netfs_limit_iter() when the iterator type is ITER_KVEC.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cae932d3aee55035a54415dcea8e7ecf2ec469b5 before 18c2e20b42dd21db599e42d05ddaeeb647b2bb6d; from cae932d3aee55035a54415dcea8e7ecf2ec469b5 before 4bc2d72c7695cedf6d4e1a558924903c2b28a78e; from cae932d3aee55035a54415dcea8e7ecf2ec469b5 before 00d6df7115f6972370974212de9088087820802e; from cae932d3aee55035a54415dcea8e7ecf2ec469b5 before 67e467a11f62ff64ad219dc6aa5459e132c79d14	CNA record
linux linux_kernel linux:linux_kernel	from 6.8 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; 7.0; 7.0; 7.0; 7.0; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d	patch
https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e	patch
https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e	patch
https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.